CN104094692A - Method for reducing slope cropland non-point source pollution by biochar-improved ecological ridge - Google Patents
Method for reducing slope cropland non-point source pollution by biochar-improved ecological ridge Download PDFInfo
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Abstract
The invention provides a method for reducing slope cropland non-point source pollution by a biochar-improved ecological ridge, and relates to building of a telescoping ecological ridge based on ADP(NH4H2PO4) modified biochar. A layout method provided by the invention comprises the steps: firstly establishing ridges at a preset interval in a direction vertical to the slope surface of a slope cropland, wherein each ridge is formed by piling up soil mixed with biochar with a preset proportion and forms a buffer strip; forming drain holes with a preset number in each buffer strip, digging a deep pit at the rear end of each drain hole, and arranging a telescoping purification device in each deep pit, wherein each telescoping purification device is formed by combining three layers, i.e., stone strips, biochar strips and clay strips and forms a filter strip; establishing a drainage channel at the rear end of the last filter strip close to the base of a slope and connecting with a riverway, so as to form a complete ecological ridge layout. By adopting the method, the nutrient substance and water utilization efficiency of the existing slope cropland can be improved, and the problems that due to surface runoff and underflow, silt flows down and migrates, and pollution by heavy metal and organic pollutants occurs can be effectively prevented.
Description
[technical field]
The slope that the present invention relates to a kind of improvement ecological ridge layout method of ploughing.Relate in particular to a kind of method that biological carbon that reduces arable land, slope pollution of area source improves ecological ridge, belong to agriculture environmental protection technical field.
[background technology]
China is large agricultural country, is accompanied by the pollution of area source problem that rural activity produces and is also on the rise.Especially after the using in a large number of chemical fertilizer, agricultural chemicals by process entered environment and the ecosystems such as migration, conversion, absorption, degradeds, inevitably cause problem of environmental pollution, comprise the pollution to animal, plant, microorganism and soil and water.The most of arable land of China is all to exist the slope of certain slope to plough, and the pattern that exists local straight plowing to do, and the furrow in arable land has promoted the formation with undercurrent that collects of rainwash, has aggravated runoff the washing away and erosion farmland tillaging layer soil that precipitation forms.The silt dropping on the one hand has very strong suction-operated to nutriments such as N, P, causes it easily with loss soil, to enter water body; The runoff that soluble heavy metal and organic pollutant easily form with precipitation or irrigation on the other hand enters water body and causes pollution of area source.Ridge is a kind of Simple engineering measure of control arable land, slope water and soil loss, can the erosion of runoff decrease to earth's surface, reach the effect of soil conservation, sediment trapping.Therefore constantly set up and improve novel ecological ridge layout method significant for reducing arable land, slope pollution of area source.
Biological carbon refers to living beings solid product after high temperature pyrolysis under oxygen free condition.< < biological carbon shows the porous of biological carbon to the Review Study > > research of the improvement of contaminated soil, recovery and reduction latent effect, larger specific surface area, aromatic structure has determined that it has good suction-operated, soil pollutant is had to very strong fixation, and the environment inclination on pollutant in soil has important impact.The biological carbon that < < beet residue is prepared through anaerobic digestion confirms that to the research > > of phosphate removal effect in solution biological carbon can Phosphate Sorption hydrochlorate, heavy metal (Cu, Cd, Pb etc.) and organic pollutant etc.Therefore the agricultural wastes (as stalk) of take are raw material; through carbonization treatment, be converted into biological carbon and biomass energy; not only can reduce the pollution that direct burning brings; alleviate the cost that stalk stores and transports; can also, as natural soil conditioner, to environmental protection and application agriculturally, there is profound significance.
Given this background is utilized biological carbon improvement soil, and building novel ecological ridge layout is extremely important for agricultural development and environmental protection.The research of relevant agricultural technology field and field of environment protection is also at development; for example application number is 200910232224.4; name is called a kind of farmland layout with function of relieving pollution of agricultural area source; publication number is CN101715663B; offer irrigation canal and drainage ditch; utilize spacer assembly that farmland is divided into conventional crop ped location and buffering area, thereby retain farmland nutrient loss, promotion plant growth, obtain the doulbe-sides' victory of economic benefit and ecological benefits.And for example application number is 201110172489.7, name is called the method for holding back the ecological revetment of removing pollution of area source based on biological reinforced that builds, publication number is CN102829632A, by screening the Black Liquor with Efficient Bacteria of efficient removal pollution of area source or building the genetic engineering bacterium that can remove persistent organic pollutants, then planting plants in hollow hexahedron ecological revetment, thereby reduce into river pollutional load, reduce the potential ecological risk that pollution of area source brings to river ecosystem.Also if application number is 201310373032.1, name is called a kind of ecological ridge that rice field pollution of area source side is oozed that reduces, publication number is CN103410118A, by building a kind of ecological ridge that comprises gravel band, biological carbon ribbon and clay Belt, thereby improve the utilization ratio in rice field and prevent that side from oozing the problem of brought moisture and nutrient loss.Though slow down the ridge layout method of pollution of area source yet above-mentioned patent has proposed some, fail to propose solution and concrete layout method effectively for arable land, China slope pollution of area source problem, and abundant not to the utilization of biological carbon and improvement.Therefore develop a kind of layout method that reduces the ecological ridge of arable land, slope pollution of area source; and utilize a kind of extension type purifier of ADP modification biological carbon to improve; for the availability that improves nutrient and moisture; effectively reduce and pollute, advance the development of agriculture environmental protection technology to play positive role.
[summary of the invention]
1, object: the object of this invention is to provide a kind of method that biological carbon that reduces arable land, slope pollution of area source improves ecological ridge, thereby improve the utilization ratio of ploughing to nutriment and moisture in slope, effectively prevent rainwash, the caused silt of undercurrent drop migration problem and heavy metal and organic pollutant pollution problem.
2, technical scheme: technical scheme of the present invention: a kind of biological carbon that reduces arable land, slope pollution of area source improves the method for ecological ridge, it is characterized in that, first in slope cultivated slope vertical direction, offer a field bund every preset distance, this field bund is piled up and is formed by the soil that mixes predetermined ratio biological carbon, forms buffer strip.On buffer strip, offer predetermined quantity discharge outlet, a dell is dug in each discharge outlet rear end, places an extension type purifier in dell, by stone band-three layers of biological carbon ribbon-clay Belts, is combined, and forms filter bag.Offering a drainage ditch near the last item filter bag rear end of bottom, slope, be connected with river course, thereby form complete ecological ridge layout.The integral layout of this ecology ridge is along the domatic direction of looking down, and buffer strip interval is even, filter bag is checkerboard type and arranges alternately.
In sum, a kind of biological carbon that reduces arable land, slope pollution of area source of the present invention improves the method for ecological ridge, and the method concrete steps are as follows:
Step 1: lay ecological ridge.Choose there is certain slope arable land as laying region, according to slope arable area size, choose buffer strip and filter bag installation position with actual pollution situation, make the integral layout of ecological ridge along the domatic direction of looking down, buffer strip interval is even, filter bag is checkerboard type and arranges alternately;
Step 2: buffer strip is set.According to arable land, selected slope actual conditions, along domatic vertical direction, every preset distance, offer a field bund, this field bund is built into predetermined altitude and width by biological carbon and soil by predetermined ratio hybrid reactor, thereby forms buffer strip;
Step 3: offer discharge outlet.On every buffer strip, by preset space length, offer predetermined quantity discharge outlet, this discharge outlet height flushes with arable land, slope ground level, plays drainage;
Step 4: offer dell.After each discharge outlet, offer the dell of a predetermined length, width, height, for placing extension type purifier;
Step 5: filter bag is set.In dell, place an extension type purifier, this device can be by regulating folding rack length and grid bag number of plies modifier size, and be chosen in the stone band of filling the different numbers of plies in grid bag, biological carbon ribbon and clay Belt according to arable land, slope real needs, thereby form by stone band-three layers of biological carbon ribbon-clay Belts filter bag combining.
Step 6: offering a drainage ditch near the last item filter bag rear end of bottom, slope, be connected with river course, thereby form complete ecological ridge layout.
Wherein, field bund described in step 2 is that the height of buffer strip is that 20～30cm, width are 30～50cm.
Wherein, field bund described in step 2 is that biological carbon and the soil predetermined mix ratio of buffer strip are 1%～10%.
Wherein, the width of discharge outlet described in step 3 is 30～100cm.
Wherein, the length of dell described in step 4 is that 100cm, width are 30～100cm, are highly 50～100cm.
Wherein, the purifier of extension type described in step 5, is the foldable structure being built into by folding rack and multilayer grid bag, and the two connects by slide block, adjusting slider position can modifier size; Folding rack material is reinforced alloy pipe, and support is divided into some sections, between each section, with chain connection, by adjusting nut, can change folding rack length; Grid bag material is stainless steel mesh, is collapsible bag shaped structure, and expansion specification is 100*10*100cm
3, deployable 10 layers at most, mesh size has 0.5,1,5, the available use of 10mm equidimension.
Wherein, the bag of grid described in step 5 can select according to local pollution situation to launch the number of plies between 3～10, every layer of width is 10cm, the concrete expansion number of plies is determined by the filling number of plies of stone band, biological carbon ribbon and clay Belt, stone band can Selective filling 1～4 layer, optional the selecting of biological carbon ribbon filled 1～3 layer, and clay Belt can Selective filling 1～4 layer.
Wherein, the gravel that the band of stone described in step 5 is 3～5mm by particle diameter, the cobble of 5～20mm and the rubble of 5～25mm mix by predetermined ratio, and stone bandwidth is 10～40cm.
Wherein, biological carbon ribbon described in step 5 is usingd corncob, cornstalk, soybean stalk and rice straw as raw material, under 350～650 ℃ of cryogenic conditions, adopts anoxic temperature control carbonizatin method, and adds modifier NH
4h
2pO
4(ADP) as the presoma inorganic agent of carbon fiber, preparation produces high-performance biological carbon, and biological carbon bandwidth is 10～30cm.
Wherein, clay Belt described in step 5 is mixed by predetermined ratio by environment-friendly materials such as clay and stem stalk, reed, wood chips, and clay Belt width is 10～40cm.
3, advantage and effect: beneficial effect of the present invention:
Ecological ridge of the present invention, use biological carbon as soil conditioner, using corncob, cornstalk, soybean stalk and 4 kinds of common living beings of paddy rice stalk as raw material, not only reduced the pollution that direct burning brings, alleviate the cost that stalk stores and transports, also improved the adsorption capacity of soil to pollutant.And all greatly improve through biological carbon output efficiency and the adsorption efficiency of ADP modification.
Filter bag of the present invention is extension type purifier, without the structure of modification of ploughing on a large scale, only need according to topography and geomorphology feature and the pollution situation of concrete territory of use, determine putting position and stone band, biological carbon ribbon and the clay Belt filling number of plies separately of filter bag.Not only solve the regional limits of traditional ridge layout method, more greatly reduced the investment of manpower and material resources in ridge layout process, simple to operate, be easy to promote, obtained the doulbe-sides' victory of economic benefit and environmental benefit.
Stone band of the present invention, biological carbon ribbon, clay Belt material therefor are all from field organic waste, economize on resources with the energy in reduced the risk that produces secondary pollution, utilizing environment-friendly material formation filter bag to cushion retains, can make nutrient and moisture be fully utilized, the loss of the silt that effectively resistance control diameter stream, undercurrent cause simultaneously, soil N, P nutrient etc.
[accompanying drawing explanation]
Fig. 1 is ecological ridge layout structure schematic diagram of the present invention, and in figure, 1 for ploughing, and 2 is buffer strip, and 3 is discharge outlet, and 4 is drainage ditch, and 5 is river course, and 6 is filter bag;
Fig. 2 is the ecological ridge layout of the present invention end view, and in figure, 1 for ploughing, and 2 is buffer strip, and 6 is filter bag, and i is the arable land gradient;
Fig. 3 is space layout's schematic diagram of buffer strip and filter bag, and in figure, 2 is buffer strip, and 5 is river course, and 6 is filter bag;
Fig. 4 is the scalable purifier schematic diagram of filter bag, and in figure, 7 is slide block, and 8 is hinge, and 9 is folding rack, and 10 is nut, and 11 is grid bag.
[embodiment]
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
See Fig. 1-Fig. 4, a kind of biological carbon that reduces arable land, slope pollution of area source of the present invention improves the method for ecological ridge, and the method concrete steps are as follows:
Step 1: lay ecological ridge.Choose the 1 conduct laying region, arable land with certain slope, according to slope arable area size and actual pollution situation, choose buffer strip 2 and filter bag 6 installation positions, make the integral layout of ecological ridge along the domatic direction of looking down, buffer strip 2 intervals are even, filter bag 6 is checkerboard type and arranges alternately;
Step 2: buffer strip 2 is set.According to arable land, selected slope actual conditions, along domatic vertical direction, every preset distance, offer a field bund, this field bund is built into predetermined altitude and width by biological carbon and soil by predetermined ratio hybrid reactor, thereby forms buffer strip 2;
Step 3: offer discharge outlet 3.On every buffer strip 2, by preset space length, offer predetermined quantity discharge outlet 3, these discharge outlet 3 height flush with arable land, slope ground level, play drainage;
Step 4: offer dell.After each discharge outlet 3, offer the dell of a predetermined length, width, height, for placing extension type purifier;
Step 5: filter bag 6 is set.In dell, place an extension type purifier, this device can be by regulating folding rack 9 length and grid bag 11 number of plies modifier sizes, and be chosen in the stone band of the different numbers of plies of the interior filling of grid bag 11, biological carbon ribbon and clay Belt according to arable land, slope real needs, thereby form by stone band-three layers of biological carbon ribbon-clay Belts filter bag combining 6.
Step 6: offering a drainage ditch 4 near the last item filter bag 6 rear ends of bottom, slope, be connected with river course 5, thereby form complete ecological ridge layout.
Embodiment 1:
The biological carbon that reduces arable land, slope pollution of area source improves a method for ecological ridge, and first in the 1 domatic vertical direction of ploughing, offer a field bund every preset distance, this field bund is piled up and formed by the soil that mixes predetermined ratio biological carbon, forms buffer strip 2.On buffer strip 2, offer predetermined quantity discharge outlet 3, discharge outlet width is 100cm, and a dell is dug in each discharge outlet 3 rear end, places an extension type purifier in dell, by stone band-three layers of biological carbon ribbon-clay Belts, is combined, and forms filter bag 6.Extension type purifier, is the foldable structure being built into by folding rack 9 and multilayer grid bag 11, and the two connects by slide block 7, the position of adjusting slider 7 can modifier size; Folding rack 9 materials are reinforced alloy pipe, and it is divided into some sections, between each section, with hinge 8, connect, and by adjusting nut 10, can change folding rack 9 length; Grid bag 11 materials are stainless steel mesh, are collapsible bag shaped structure, and expansion specification is 100*10*100cm
3, launching 10 layers, mesh size is 5mm; Offering a drainage ditch 4 near the last item filter bag 6 rear ends of bottom, slope, be connected with river course 5, thereby form complete ecological ridge layout.Described buffer strip 2 field bund height are that 25cm, width are 40cm, and it is 5% that biological carbon accounts for soil mixed proportion.Described drainage ditch 4 is 50cm with filter bag 6 spacing near at the bottom of slope.Described dell length is that 100cm, width are that 100cm, the degree of depth are 100cm.Stone band is mixed in 1:1:1 ratio by gravel, cobble and rubble, fills 3 layers, and width is 30cm.Biological carbon ribbon is usingd corncob, cornstalk, soybean stalk and rice straw as raw material, under 450 ℃ of cryogenic conditions, adopts anoxic temperature control carbonizatin method, and adds modifier NH
4h
2pO
4(ADP) as the presoma inorganic agent of carbon fiber, preparation produces high-performance biological carbon, fills 3 layers, and width is 30cm.Clay Belt is mixed in 7:1:1:1 ratio by clay and stem stalk, reed, three kinds of environment-friendly materials of wood chip, fills 4 layers, and width is 40cm.
By following examples, verify beneficial effect of the present invention.
Example is positioned at 859 farms of northeast, the Three River Plain, and the arable land 1 of choosing gentle slope in corn dry land is objective for implementation.This 1 gradient of ploughing is 5 ° of left and right, the wide about 100*200m of the long * of domatic scope
2.While laying ecological ridge, first along contour, 3 field bunds are set and form 3 buffer strips 2, specification is the trapezoidal cross-section of upper top width 30cm, lower bottom width 40cm, is highly 25cm.Between each buffer strip 2, spacing is 65m left and right, lays respectively at apart from slope and pushes up on the position of about 65m, 130m and 195m.On the buffer strip 2 apart from top, slope 65m, offer 3 discharge outlet, discharge outlet width is 100cm, and discharge outlet lays respectively at distance arable land 1 left end border 20m, 50m and 90m place; On the buffer strip 2 apart from top, slope 130m, offer 3 discharge outlet, discharge outlet width is 100cm, and discharge outlet 3 lays respectively at distance arable land 1 left end border 10m, 40m, 80m place; On the buffer strip 2 apart from top, slope 195m, offer 4 discharge outlet, discharge outlet width is 100cm, wherein have 2 discharge outlet to be opened in respectively and be close to the left margin in arable land 1 and the position of right margin, other 2 discharge outlet lay respectively at distance arable land 1 left end border 30m and 60m place.1 extension type purifier of the rear placement of each discharge outlet 3 forms filter bag 6, and filter bag 6 is spatially checkerboard type to be arranged alternately, therefore should be not point-blank along the position of offering of domatic vertical direction discharge outlet 3, but offer along longitudinal axis is staggered.The concrete laying mode of filter bag 6 is: dig 3 specifications apart from 3 discharge outlet 3 rear ends at 65m place, top, slope, for the wide * of long * is high, be first 100*100*100cm
3dell, place an extension type purifier launching completely in each dell, each device is filled 3 layers of stone band, width is 30cm, 3 layers of biological carbon ribbon, and width is 30cm, 4 layers of clay Belt, width is 40cm, forming specification is that the wide * height of long * is 100*100*100cm
3filter bag 6.Then dig 3 specifications apart from 3 discharge outlet 3 rear ends at 130m place, top, slope, for the wide * of long * is high, be 100*80*100cm
3dell, place the scalable purifier that a part is launched in each dell, fill respectively 3 layers of stone band, width is 30cm, 2 layers of biological carbon ribbon, width is 20cm, 3 layers of clay Belt, width is 30cm, form specification for the wide * height of long * be 100*80*100cm
3filter bag 6.Finally at the bottom of slope, 4 specifications are dug for the high 100*60*50cm of being of the wide * of long * in 4 discharge outlet 3 rear ends at 195m place
3dell.The interior scalable purifier of placing a part expansion of each dell, fills respectively 2 layers of stone band, and width is 20cm, 1 layer of biological carbon ribbon, and width is 10cm, 3 layers of clay Belt, width is 30cm, forming specification is that the wide * height of long * is 100*60*50cm
3filter bag 6.Wherein biological carbon used is usingd cornstalk as raw material, under 450 ℃ of cryogenic conditions, adopts anoxic temperature control carbonizatin method, by adding modifier NH
4h
2pO
4(ADP) process and make, buffer strip 2 biological carbon and soil mixed proportion are 5%.Stone band is mixed in 1:1:1 ratio by gravel, cobble and rubble, successively adds and compacting.Biological carbon and the soil mixed proportion of biological carbon ribbon are 3%.Clay Belt is piled up and is formed by the clay that adds 10% stem stalk chip, 10% reed chip and 10% wood chip.
Above ecological ridge layout method, reaches 58% to the adsorption rate of herbicide atrazine, to the adsorption rate of heavy metal lead up to 99%, to organic phosphor clearance up to 100%.
Claims (10)
1. the biological carbon that reduces arable land, slope pollution of area source improves a method for ecological ridge, it is characterized in that: the method concrete steps are as follows:
Step 1: lay ecological ridge; Choose there is certain slope arable land as laying region, according to slope arable area size, choose buffer strip and filter bag installation position with actual pollution situation, make the integral layout of ecological ridge along the domatic direction of looking down, buffer strip interval is even, filter bag is checkerboard type and arranges alternately;
Step 2: buffer strip is set; According to arable land, selected slope actual conditions, along domatic vertical direction, every preset distance, offer a field bund, this field bund is built into predetermined altitude and width by biological carbon and soil by predetermined ratio hybrid reactor, thereby forms buffer strip;
Step 3: offer discharge outlet; On every buffer strip, by preset space length, offer predetermined quantity discharge outlet, this discharge outlet height flushes with arable land, slope ground level, plays drainage;
Step 4: offer dell; After each discharge outlet, offer the dell of a predetermined length, width, height, for placing extension type purifier;
Step 5: filter bag is set; In dell, place an extension type purifier, this device is by regulating folding rack length and grid bag number of plies modifier size, and be chosen in the stone band of filling the different numbers of plies in grid bag, biological carbon ribbon and clay Belt according to arable land, slope real needs, thereby form by stone band-three layers of biological carbon ribbon-clay Belts filter bag combining;
Step 6: offering a drainage ditch near the last item filter bag rear end of bottom, slope, be connected with river course, thereby form complete ecological ridge layout.
2. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: field bund described in step 2 is that the height of buffer strip is that 20～30cm, width are 30～50cm.
3. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: field bund described in step 2 is that biological carbon and the soil predetermined mix ratio of buffer strip is 1%～10%.
4. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: the width of discharge outlet described in step 3 is 30～100cm.
5. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: the length of dell described in step 4 is that 100cm, width are 30～100cm, are highly 50～100cm.
6. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: the purifier of extension type described in step 5, it is the foldable structure being built into by folding rack and plural layer grid bag, the two connects by slide block, adjusting slider position energy modifier size; Folding rack material is reinforced alloy pipe, and support divides the section of pluralizing, and between each section, with chain connection, by adjusting nut, changes folding rack length; Grid bag material is stainless steel mesh, is collapsible bag shaped structure, and expansion specification is 100*10*100cm
3, launching at most 10 layers, mesh size has 0.5,1,5, the selective use of 10mm size.
7. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: the bag of grid described in step 5 selects to launch the number of plies between 3～10 according to local pollution situation, every layer of width is 10cm, the concrete expansion number of plies is determined by the filling number of plies of stone band, biological carbon ribbon and clay Belt, 1～4 layer of stone band Selective filling, 1～3 layer of biological carbon ribbon Selective filling, 1～4 layer of clay Belt Selective filling.
8. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: the gravel that the band of stone described in step 5 is 3～5mm by particle diameter, the cobble of 5～20mm and the rubble of 5～25mm mix by predetermined ratio, stone bandwidth is 10～40cm.
9. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: biological carbon ribbon described in step 5 is usingd corncob, cornstalk, soybean stalk and rice straw as raw material, under 350～650 ℃ of cryogenic conditions, adopt anoxic temperature control carbonizatin method, and add modifier NH
4h
2pO
4as the presoma inorganic agent of carbon fiber, preparation produces high-performance biological carbon, and biological carbon bandwidth is 10～30cm.
10. a kind of biological carbon that reduces arable land, slope pollution of area source according to claim 1 improves the method for ecological ridge, it is characterized in that: clay Belt described in step 5 is mixed by predetermined ratio by clay and stem stalk, reed, wood chip material, and clay Belt width is 10～40cm.
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| CN105040650A (en) * | 2015-07-06 | 2015-11-11 | 云南省农业科学院农业环境资源研究所 | Constructing method for carbon dams capable of intercepting nutrient loss of farmland |
| CN105481029A (en) * | 2015-12-11 | 2016-04-13 | 北京建筑大学 | Method and device for synergetically removing multiple heavy metals and polycyclic aromatic hydrocarbon in runoff rainwater |
| CN109692509A (en) * | 2019-03-07 | 2019-04-30 | 天津市实验林场 | A method of rice field tail water is administered using charcoal |
| CN111229821A (en) * | 2018-11-29 | 2020-06-05 | 冯书妙 | Biological remediation method for saline-alkali harmful soil |
| CN113475181A (en) * | 2021-07-19 | 2021-10-08 | 沣田宝农业科技有限公司 | Comprehensive treatment system and method for saline-alkali soil |
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